How do I measure the effectiveness of my cart recovery efforts?

I've been running my Shopify store for two years now, and cart abandonment has always been this frustrating black box. I can see people adding products, getting tantalizingly close to purchasing, and then... nothing. My gut tells me I'm losing serious revenue, but I can't pinpoint exactly why or how much. I've tried generic abandoned cart email flows, but they feel like shooting in the dark. I need a systematic way to understand what's happening in those critical moments between 'add to cart' and 'complete purchase'. Are visitors getting cold feet? Are my shipping costs too high? Is the checkout process too complicated? Without clear data, I'm essentially running my business with a blindfold on. I want granular insights that tell me not just how many carts are abandoned, but WHY they're being abandoned, and most importantly, how I can recover those potential sales effectively.